I mean, to this day I haven't played a Minecraft clone that left me satisfied so I doubt Mr. Bored Depressed Billionaire over there will manage to capture lighting in a bottle twice...
(And I doubt he's using his free time to learn a new programming language either so it's gonna be Java again god help us all)
To be fair I'm being a dickhead.
I'm sure Minecraft's slowness has more to do with how it was built/tech debt and such than Java itself, as the mods that massively boost performance show.